JPH0238284B2 - PAIPUTOITAZAITONOSETSUGOHOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for orthogonally joining a pipe and a plate-like member, such as when manufacturing a flanged pipe or a lever-equipped pipe.

Conventionally, in order to join a pipe to a plate that is perpendicular to the pipe, it is common to drill holes at key points in the plate, fit the pipe into the holes, and weld the two together.

However, such a welding method has problems in that the welding work is troublesome, build-up occurs in the welded area, making it unsightly, and in some cases, the build-up gets in the way.

On the other hand, as described in Japanese Patent Application Laid-Open No. 113463/1983, an annular groove is provided on the inner surface of a hole in a member to be fixed, and a part of the pipe inserted into the hole is expanded to open the groove. Some methods connect the two by biting into the pipe, but there is a problem in that a considerable amount of force is required to expand the pipe, and furthermore, it is difficult to firmly connect the two.

Furthermore, as shown in Japanese Patent Publication No. 52-16989, fluid pressure is introduced into the pipe inserted into the hole in the member to be fixed, and the part other than the hole is made to have a diameter slightly larger than the diameter of the hole. Some systems supply both by bulging so that the pipe is inserted into the hole of the member to be fixed, but it is not easy to insert the pipe deeply and reliably into the hole of the member to be fixed, and both the There is a problem in that very careful and powerful machining is required to prevent relative movement.

The present invention was made in order to understand these problems in the prior art, and its feature is that a plate with a diameter slightly larger than that of the pipe is installed at key points of the plate material to be connected to the pipe. At the same time as drilling a hole, a large number of strips oriented in the axial direction were carved on the inner circumferential edge of the hole, and annular grooves slightly wider than the thickness of the plate were carved at key points of the pipe. By inserting the pipe into the hole in the plate material and aligning the annular groove with the plate material, the pipe is bulged so that the bottom of the annular groove of the pipe bites into the strip of the hole in the plate material, and the pipe is The outer peripheries on both sides of the annular groove are engaged with both sides of the hole in the plate material.

Next, embodiments of the present invention will be described based on the drawings.

Reference numeral 1 denotes a plate material, with holes 2 drilled at key points, and a large number of strips 2' oriented in the axial direction formed on the inner peripheral edge of the holes 2.

A pipe 3 has an outer diameter that allows it to be inserted freely into the hole 2 of the plate 1, and an annular groove 4 slightly wider than the thickness of the plate 1 is cut at key points on its outer surface.

Reference numerals 5 and 6 denote bulge molding molds, in which the plate material 1 is accommodated in recesses 7 and 8 on opposing surfaces, and pipes 3 are similarly fitted into cylindrical holes 9 and 10;
The annular groove 4 is aligned with the plate 1.

Note that the cylindrical holes 9 and 10 are formed in the plate material 1 except for both ends.
The diameter is slightly larger than the circumscribed circle of the strip 2' of the hole 2.

The free end of the cylindrical hole 10 of one bulge mold 6 is
Plug 11 is closed.

From the opening side of the cylindrical hole 9 of the other bulge mold 5,
When fluid pressure is introduced and bulge processing is performed, pipe 3
are expanded in diameter until their outer surfaces come into close contact with the cylindrical holes 9 and 10.

As a result, the diameter of the bottom portion of the annular groove 4 of the pipe 3, which is rather thin, is also expanded, and the outer peripheral portion thereof is reliably inserted into the strip 2' of the hole 2 of the plate material 1.

In the plate material 1 and the pipe 3 that are connected in this way, the side surfaces of the annular groove 4 are engaged with both sides of the hole 2 of the plate material 1, so that the two will never move relative to each other in the axial direction. do not have.

Further, since the outer circumferential portion of the pipe 3 bites into the many strips 2' oriented in the axial direction, there is no relative movement between the two in the circumferential direction.

Thus, according to the present invention, the plate and the pipe can be reliably and firmly connected by simple means and operations.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view schematically illustrating the implementation of the present invention, and FIG. 2 is a longitudinal sectional view taken along the line A--A in FIG. 1. 1... Plate material, 2... Hole, 2'... Strip, 3...
Pipe, 4... Annular groove, 5, 6... Bulge mold, 7, 8... Concave, 9, 10... Cylindrical hole, 11...
…plug.

Claims (1)

[Claims] 1. Drill a hole with a slightly larger diameter than the pipe at a key point in the plate material to be connected to the pipe, and carve a number of strips oriented in the axial direction on the inner peripheral edge of the hole, and Cutting an annular groove slightly wider than the thickness of the plate material at important points, inserting the pipe into the hole in the plate material, and bulging the pipe while aligning the annular groove with the plate material. A joint between a pipe and a plate material, characterized in that the bottom of the annular groove of the pipe is bitten into the strip of the hole in the plate material, and the outer peripheries on both sides of the annular groove in the pipe are locked to both sides of the hole in the plate material. Method.